title: Spin-orbit splitting in single-layer MoS2 revealed by triply resonant Raman scattering.
abstract: Although new spintronic devices based on the giant spin-orbit splitting of single-layer MoS(2) have been proposed, such splitting has not been studied effectively in experiments. This Letter reports the valence band spin-orbit splitting in single-layer MoS(2) for the first time, probed by the triply resonant Raman scattering process. We found that upon 325 nm laser irradiation, the second order overtone and combination Raman modes of single-layer MoS(2) are dramatically enhanced. Such resonant Raman enhancement arises from the electron-two-phonon triple resonance via the deformation potential and Fröhlich interaction. As a sensitive and precise probe for the spin-orbit splitting, the triply resonant Raman scattering will provide a new and independent route to study the spin characteristics of MoS(2).
authors.affiliation: Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Linfeng
authors.initials: L
authors.lastname: Sun
authors.forename: Jiaxu
authors.initials: J
authors.lastname: Yan
authors.forename: Da
authors.initials: D
authors.lastname: Zhan
authors.forename: Lei
authors.initials: L
authors.lastname: Liu
authors.forename: Hailong
authors.initials: H
authors.lastname: Hu
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Ben Kang
authors.initials: BK
authors.lastname: Tay
authors.forename: Jer-Lai
authors.initials: JL
authors.lastname: Kuo
authors.forename: Chung-Che
authors.initials: CC
authors.lastname: Huang
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Hewak
authors.forename: Pooi See
authors.initials: PS
authors.lastname: Lee
authors.forename: Ze Xiang
authors.initials: ZX
authors.lastname: Shen